10. 



TSQhinostpma revo lutum suggests that Loose (1899, pp, 679- 

 684} and others, hnve placed several species under this one 

 name. Vhis will be nio re carefully discussed under the 

 heading of the adult eohinostome. 



Infrttion of Snails *nd Development of Mother -Mediae, 



Young snails of hy.a. o cci dent al is were placed in 



dishes with the eggs of Schinos to ma revolutum in 



the niraoidia ware almost fully developed* These 

 young snails wer Vnown to be free from any trematcde 

 infection sinoe t>iey were raised in sar^H aquaria from 

 eggs produce*! during t>ie months of August and September 



191 B To ma^e doubly out, many of the young snails were 

 billed and ^irefully ex^siin^d but all those examinations 



' * *^^F ** 4 ^l , i, " . ,L ..% '^. Q 



Jtive results* 



At the time of the first experiments the snails were 

 jioout six months old* Usually eight snails were placed in 

 eich syr \rjuse dish with about fifteen e/5gs. During the 

 firot day almost all of the eggs were eaten b# the nnnils 

 out they passed / the digestive tr-*ot of the snails 



unharmed* They reranined in the fe^es until ti*ey hatched. 



- t -" 

 which occurred -it the end of twenty -one days. 



In one syraouae dish in which no young snails w^re 

 placed, the fooveraent of the rairaoiuia outside the egg 

 wa studied* Their activity ia much liJke other miracidia 

 for about twenty -four hours. At the end of that time the 

 vigorous activity quite rapidly subsides, followed in a 

 short time by a bracking of the body wall and the extrusion 

 of some of the contents. 



